Optical communications – Transmitter – Including compensation
Reexamination Certificate
2007-12-11
2007-12-11
Li, Shi K. (Department: 2613)
Optical communications
Transmitter
Including compensation
Reexamination Certificate
active
10407520
ABSTRACT:
An optical modulating device including a driving circuit generating a driving voltage corresponding to an input signal, an oscillator generating a signal having a low frequency signal lower than that of the input signal, an MZ modulator receiving a DC bias voltage superposed with the low frequency signal and the driving voltage, to generate a modulated optical signal according to the input signal, a photoelectric converting unit for converting the modulated optical signal into an electric signal, a low frequency signal detecting circuit which extracts the low frequency signal component contained in the electric signal, multiplies the low frequency signal component by the low frequency signal outputted by the low frequency oscillator, and then extracts a DC component from a multiplied output signal, and a control circuit for extracting a maximized DC component from the low frequency signal detecting circuit by controlling the DC bias voltage.
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Agatsuma Hiroyuki
Khayim Tattee
Koga Ko
Sugawara Mitsuru
Tanikoshi Sadao
Hogan & Hartson LLP
Li Shi K.
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